Improvement in angle attachments for dental engines



E. T. sum. v ANGLE ATTACHMENT-S FOR'DENTAL ENGINES.

Patented Jan. 23, I877.

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13;; m mu PMOWUTNOGRAPMER, WASHING ON. D 1.

UNITED $TATEs ELI 'rfs'rARR, on PHILADELPHIA, PENnsYLvANIA, AssIeNon 1 s. WHITE, OF SAME PLACE. 4

Arena Demos.

T0 SAME.

IMPROVEMENT in ANGLE ATTAcH M NTs FOR DENTAL ENGINES.

Specification forming part of Letters Patent No. 186,504, dated J annary 23, 1877; application filed December 5, 1876.

To all whom it may concern:

Be it known that I, ELI T. atrium, of the city and county of-Philadelphia, and State of Pennsylvania, have invented certain new and d useful Improvements'in Tool-Carrier Attachments being shown as adapted for application to the hand-piece of the well-known S. S. White dental engine; Fig. 2, an enlarged view, partly in section, showing the shank of a tool inserted and locked in its socket; Fig. 3, a similar view to Fig. 2, the parts being in a different position. Figs. 4. and 5 are sectional views on the lines as and 3 respectively, of

Figs. 2 and 3; and Fig. 6, a view, in perspective, of a tool-shank adapted to the device.

My improved attachment is composed of a slotted tubular portion, A, to which is firmly attached in any suitable manner, or in some instances may form a part thereof, aforked arm or support, B, which carries the tool-retainin g mechanism. This tool-retaining mechanism consists ofa socket, O, lying at right angles to, and the ends of which fit and turn in, the forksof the arm B, it being enveloped by, and driven with, a geared sleeve, D, which Works between the forks of said arm B, and. to which motion is communicated through a bevel-pinion, E, keyed on the end of a shaft or spindle, F, having its hearings in the attachment, said spindle being adapted to engage with the chuck of the hand-piece of'a dental engine, and be driven thereby, when the attachment isapplied to use in usual wellknown ways. In the socket G is a transverse pin, 0, tangential to the bore thereof, which engages with the wedgeshaped eccentricallygrooved shank of the tool inserted therein,

substantially as shown and described in Letters Patent granted to William R. N utz, June 2, 1874, No. 151,614, and is consequently not broadly claimed herein.

A spring-arm or leaf-spring, H, is secured, in this instance, to the rear side of the arm B, and carries a turning wedge, I, which wedge is adapted to enter the socket (J, to engage with and lock the tool in the socket. This spring-arm, it will be observed, is hook-shaped, so as to bend over the top of the arm 13, and form a stop to prevent the wedge from being drawn entirely out of its socket.

By mounting the driving-sleeve D in bearings at both ends in a line forming a prolongation of the' tubular portion of the attachment, as shown, I am enabled materially to shorten the distance between the point of the tool and the back of its holder, which is a great advantage, as the tool has to be used in a very confined space.

I have described the transverse locking-pin c as tangential to-the bore of the socket, which construction I prefer; but, obviously, a radial pin or stud projecting partially into the bore might be used with a corresponding alteration in the tool-shank and its locking-wedge.

To secure'a tool in its socket it is only necessary to insert its wedge-shaped shank therein, and turn itto the right or left until the eccentric groove engages with. the transverse pin 0, at which time the locking-wedgeis forced forward by its spring, and engages withthe inclined end of the tool, and forming, as it were, a continuation thereof, thus securely locking the tool in the socket. To release the tool the locking-wedge should be raised, its

upward movement being limited by the hooked" end of the carrying-spring abutting against the forked arm, and the tool turned to the right or left to disengage it from the transverse pin, which leaves it free to be removed.

I claim as my invention-- 1. The combination, substantially as hereinloefore set forth, in a right-angled attachment for dental engines, of the tubular portion, its forked arm, and tool-retaining mechanism turning in bearings in said arm.

2. Thecombination, substantially as hereinbet'ore set forth, of the tubular portion, its

forked arm, tool-retaining mechanism, having 4. The combination, substantially as here it's-bearings in-said arm, and. the driving-gear inbeforeset forth, oft'he tool-socket,thespringon the said tool-retaining mechanism, where arm mounted on the socket-support, and the by space is enconomized, and a steady movelocking-wedge revolving in said spring with ment and firm bearing of the tool secured. the operating-tool. 3. The tool-retaining mechanism, substan- In testimony whereof I have hereunto subtiall; as set forth,-eonsisting of the combinascribed my name.

tion of the turning socket, its transverse pin 0, ELI T. STARR.

and the wedge, whereby a toolvinserted into Witnesses:

said mechanism is securely locked against ac- J 08. B. HOUGH,

cidenta'l displacement and pulling strain. J. A. B. WILLIAMS. 

